66666667

66666667 is the eight-digit natural number 66,666,667 in the decimal system. Its decimal representation is notable for seven consecutive 6 digits followed by a final 7.

It is odd and not divisible by 2 or 5. The sum of its digits is 49, which means the number is congruent to 1 modulo 3 and 4 modulo 9. It is not divisible by small primes such as 2, 3, 5, 7, 11, or 13.

In other bases, its hexadecimal representation is 0x3F940AB. It sits near two-thirds of 100,000,000 (which equals 66,666,666.666…), lying just one above the integer part of that value.

Context: numbers with repeated digits, such as seven 6s followed by a 7, are sometimes used in examples of numeral formatting, data entry tests, or as simple references in arithmetic demonstrations. The value 66,666,667 is primarily of interest as a large eight-digit integer with a distinctive decimal pattern, rather than for any notable widely recognized mathematical property.